The part of the stage in front of the curtain is known as the

Wings refer to the areas on the sides of the stage that are not visible to the audience, providing space for actors and scenery to wait or be stored. While wings are essential for stage movement and scene transitions, they are not located in front of the curtain.

An arena stage is a type of theater layout where the audience surrounds the stage on all sides. This structure is distinct from the traditional proscenium stage with an apron and does not define a specific part of the stage itself.

A platform is a flat, raised surface that can be used for performances or presentations but is not specifically the area in front of the curtain. Platforms can exist in various configurations throughout a theater and do not uniquely denote the apron.

A rise refers to an elevation on the stage, often used to create levels for dramatic effect. While it is a component of stage design, it does not specifically indicate the area in front of the curtain, which is designated as the apron.